Should I upgrade to Windows 7?

Short Version: 

Yep. Install now.

A Bit More.

Operating System upgrades are a big deal from your computer’s perspective, so it’s not an automatic decision.

If you are running Vista, upgrade. Do it. Win7 is Vista refined.

If you are running XP, only upgrade if your computer is 2 years old or newer or if you have 2 gigs of RAM or more.

The more RAM in your computer, the better.

Windows 7 was released October 22, 2009 with pre-release versions available months before that.